Most of the times "disastrous" is just a figure of expression and all it means is:

Somewhat painful or borderline uncomfortable.

Most of the times safe or harmless is much more Disastrous than Disastrous.

What silent "safe" choices are killing your business or your career? The question isn't if you can identify these choices. The question is, do you have the courage to confront the safe and give disastrous a fair chance?